package com.lagou.web.servlet;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.SimplePropertyPreFilter;
import com.lagou.base.BaseServlet;
import com.lagou.pojo.Course;
import com.lagou.service.CourseService;
import com.lagou.service.impl.CourseServiceImpl;
import com.lagou.utils.DateUtils;

import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import java.util.Map;

@WebServlet("/course")
public class CourseServlet extends BaseServlet {
        //查询信息列表
        public void findCourseList(HttpServletRequest request, HttpServletResponse response){
            try {
                //1.接收参数

                //2.业务处理
                CourseService cs=new CourseServiceImpl();
                List<Course> courseList = cs.findCourseList();

                //3.响应结果
                SimplePropertyPreFilter filter=new SimplePropertyPreFilter(Course.class,
                        "id","course_name","price","sort_num","status");
                String result = JSON.toJSONString(courseList,filter);

                response.getWriter().print(result);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        //根据条件查询课程信息
    public void findByCourseNameAndStatus(HttpServletRequest request,HttpServletResponse response){
        try {
            //1.接受参数
            String course_name = request.getParameter("course_name");
            String status = request.getParameter("status");

            //2.业务处理
            CourseService cs=new CourseServiceImpl();
            List<Course> courseList = cs.findByCourseNameAndStatus(course_name, status);

            //3.返回结果
            SimplePropertyPreFilter filter=new SimplePropertyPreFilter(Course.class,"id", "course_name","price","sort_num","status");
            String result = JSON.toJSONString(courseList, filter);

            response.getWriter().print(result);
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    //根据课程ID查询课程信息
    public void findCourseById(HttpServletRequest request,HttpServletResponse response){
        try {
            //1.接受参数
            String id = request.getParameter("id");
            //2.业务处理
            CourseService cs=new CourseServiceImpl();
            Course course = cs.findCourseById(Integer.parseInt(id));
            //3.返回结果
            SimplePropertyPreFilter filter=new SimplePropertyPreFilter("id",
                    "course_name","teacher_name","teacher_info","price","price_tag",
                    "discounts","preview_first_field","preview_second_field","course_img_url",
                    "share_title","share_description","course_description","share_image_title"
                    );
            String result = JSON.toJSONString(course,filter);
            response.getWriter().print(result);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //修改课程状态
    public void updateCourseStatus(HttpServletRequest request,HttpServletResponse response){
        try {
            String id=request.getParameter("id");
            CourseService cs=new CourseServiceImpl();
            Course course = cs.findCourseById(Integer.parseInt(id));
            int status = course.getStatus();
            if(status==0){
                course.setStatus(1);
            }else{
                course.setStatus(0);
            }

            course.setUpdate_time(DateUtils.getDateFormart());
            Map<String, Integer> map = cs.updateCourseStatus(course);
            String result = JSON.toJSONString(map);
            response.getWriter().print(result);
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}
